Pulp and paper mill effluents contain neuroactive substances that potentially disrupt neuroendocrine control of fish reproduction
| Autor: | Chieu Anh Ta, Jinqin Mao, Vance L. Trudeau, Andrew Waye, Mark Hewitt, Niladri Basu, John T. Arnason |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Paper
Industrial Waste Neurotransmission Biology engineering.material Waste Disposal Fluid gamma-Aminobutyric acid Receptors Dopamine Phenols Neurotransmitter receptor Goldfish medicine Environmental Chemistry Animals Receptor Monoamine Oxidase Flavonoids business.industry Pulp (paper) Reproduction Glutamate receptor Brain Polyphenols Paper mill General Chemistry Glutamic acid Neurosecretory Systems Biochemistry Spiperone engineering Solvents business Water Pollutants Chemical medicine.drug Environmental Monitoring |
| Zdroj: | Environmental sciencetechnology. 43(5) |
| ISSN: | 0013-936X |
| Popis: | Here we show for the first time that components of pulp and paper mill effluents contain neuroactive substances that may impair fish reproduction. Grab samples of primary and secondary effluent were obtained from a representative pulp and paper mill in Eastern Canada. Effluents were fractionated using classic polarity and polyphenolic extraction methods into solvents of selected polarities (water, ethanol, ethyl acetate, and hexane). By means of in vitro, competitive assays on goldfish (Carassius auratus) brain tissues, the extracts were screened for their ability to interact with enzymes and receptors involved in gamma-aminobutyric acid (GABA), dopamine, glutamate, and acetylcholine-dependent neurotransmission. These neurotransmission pathways have essential regulatory roles in fish reproduction. Radioligand binding to the following neurotransmitter receptors were significantly impacted following in vitro incubations with extracts (percentage change from controls indicated in brackets): dopamine-2 (D2; 21-48% increase), GABA(A) receptor binding (65-67% decrease and 189% increase), N-methyl-o-aspartic acid (NMDA; 26-75% decrease), and muscarinic cholinergic (mACh; 42% increase). Activities of the following neurotransmitter-related enzymeswere significantly impacted: monoamine oxidase (MAO; 14-48% decrease), GABA-transaminase activity (33% decrease and 21-69% increase), and acetylcholinesterase (AChE; 21-50% decrease). No changes in glutamic acid decarboxylase (GAD) activity were detected. These findings provide a novel and plausible mechanism by which pulp and paper mills effluents impair fish reproduction by interacting with neurotransmitter systems. Furtherwork is required to identify the active compounds and explore whether these changes occur in vivo. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|